KR101682402B1 - Vacuum centrifugal casting apparatus - Google Patents

Abstract

The present invention relates to a vacuum centrifugal casting apparatus in which a separable chamber is constructed to be detachable from a rotary shaft such that the separable chamber after completing injection of molten material is separated to be cooled without having to wait for cooling after completion of injecting molten material; and is able to perform immediately a centrifugal casting by mounting a new separable chamber on the rotary shaft, thereby enabling mass production through continuous casting.

Description

≪ Desc / Clms Page number 1 > Vacuum centrifugal casting apparatus for titanium watch &

[0001] The present invention relates to a vacuum centrifugal casting apparatus, and more particularly to a vacuum centrifugal casting apparatus capable of engaging and disengaging a separable chamber with a rotary shaft, thereby releasing the whole of the separable chamber after completion of injection of the melt, This is about the technology that enables the work to proceed.

Casting is a process of injecting a molten metal into a mold, cooling it, and then removing the mold to produce a desired product. A number of casting devices have been developed to efficiently perform the casting operation.

Particularly, when a compact product with a small size, or a thin product with a very thin thickness is molded through casting, a precision casting method is used. A vacuum centrifugal casting is used as one of the precision casting methods.

Vacuum centrifugal casting is a method in which a product is molded by injecting a melt into a crucible rotating at a constant speed or more and filling the mold with a melt which is separated from the crucible by centrifugal force.

However, in the conventional vacuum centrifugal casting apparatus, after the molten metal is completely injected into the mold, it takes time to wait until the molten metal injected into the mold cools down, thereby limiting the productivity.

On the other hand, Korean Patent No. 10-1538113 and the like have been known as a related art related to centrifugal casting.

Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide a separable chamber which can be coupled to and detached from a rotary shaft, It is an object of the present invention to provide a technique for continuously performing a casting operation by omitting a waiting time for melting the molten metal by mounting the chamber.

According to an aspect of the present invention, there is provided a vacuum centrifugal casting apparatus comprising: a rotating shaft rotatably receiving power from a motor and having a ring insertion groove formed at a side thereof; And a detachable chamber having a coupling hole into which the upper portion of the rotating shaft is fitted and having a fixing ring fitted in the loop insertion groove.

In this case, a locking protrusion is formed in the ring insertion groove entrance of the rotation shaft, so that it is prevented that the locking ring of the separation chamber is detached after being pushed into the ring insertion groove of the rotation shaft.

In addition, in the detachable chamber, the fixing ring may be rotatably hinged, and the holding block may be extended from the hinged portion.

In addition, the upper portion of the rotary shaft may have a tapered shape so that the width thereof becomes narrower toward the upper side, and the coupling hole of the separate chamber may have a shape corresponding to the upper portion of the rotary shaft and narrower toward the upper side.

The separation chamber may be provided with a plate-shaped float prevention blade having a diagonal line so that the lower side of the separation chamber faces the direction of travel of the separation chamber and the upper side thereof is opposite to the direction of travel.

In the present invention, since the separable chamber is manufactured in a structure capable of being coupled with and separated from the rotation shaft, it is not necessary to wait until the cooling process is completed after the melt injection process. That is to say, once the melt has been injected, the separable chamber can be removed from the rotating shaft and a new separable chamber can be installed to start the centrifugal casting immediately and at the same time the inert gas can be injected into the detached separable chamber to cool the product It can be produced in large quantities.

1 is a view for explaining a vacuum centrifugal casting apparatus according to an embodiment of the present invention;
FIG. 2 is a perspective view conceptually showing a state in which a separation-type chamber and a rotation axis are separated from each other in the vacuum centrifugal casting apparatus shown in FIG. 1. FIG.
FIG. 3 is a perspective view conceptually showing a state in which a separation-type chamber and a rotation axis are coupled to each other in FIG. 2. FIG.
Fig. 4 is a front view of a state in which the separation chamber and the rotation shaft are engaged; Fig.
5 is a view for explaining a state in which a fixing hook is fitted in a ring insertion groove of a rotary shaft;
6 is a plan sectional view schematically showing the inside of the first chamber.
7 is a side sectional view schematically showing the inside of the first chamber;
FIG. 8 is a view for explaining a casting process using the vacuum centrifugal casting apparatus shown in FIG. 1; FIG.
9 is a view for explaining an example of a product produced using the vacuum centrifugal casting apparatus shown in Fig.
FIG. 10 is a view showing a separation chamber and a rotation axis for explaining a vacuum centrifugal casting apparatus according to another embodiment of the present invention; FIG.
Figure 11 is a side view of the first chamber of the detachable chamber in Figure 10;

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. However, some configurations which are not related to the gist of the present invention may be omitted or compressed, but the configurations omitted are not necessarily required for the present invention, and they may be combined by a person having ordinary skill in the art to which the present invention belongs. .

1 is a view for explaining a vacuum centrifugal casting apparatus according to an embodiment of the present invention. 1, a vacuum centrifugal casting apparatus according to an embodiment of the present invention includes a main body 100 having a space for centrifugal casting, a vacuum device 180 for evacuating the inside of the chambers 111 and 121, And a grasping means 190 for grasping the separable chamber 110.

FIG. 2 is a perspective view conceptually showing a state in which the separable chamber 110 and the rotary shaft 150 are separated from each other in the main body 100 in the vacuum centrifugal casting apparatus shown in FIG. 1. FIG. FIG. 4 is a front view illustrating a state in which the separation chamber 110 and the rotation shaft 150 are coupled. FIG.

2 to 4, a rotating shaft 150 rotating by driving the motor 170 and a detachable chamber 110 detachably coupled to the rotating shaft 150 are disposed in the main body 100.

A pulley 155 is provided at a lower portion of the rotary shaft 150 and receives power from the motor 170 through a belt 160 installed on the pulley 155 to rotate the rotary shaft 150. The structures of the motor 170, the belt 160 and the pulley 155 shown in the figure are only conceptually shown, and the power transmission system can be implemented in various ways.

The upper portion of the rotary shaft 150, that is, the upper shaft portion 151, is formed to have a smaller diameter toward the upper side. This is to ensure smooth insertion and withdrawal of the separable chamber 110 when mounting the separable chamber 110 to the shaft top 151.

The support part 130 of the separate chamber 110 is caught under the shaft upper part 151 which is tapered at the rotary shaft 150 so that the seating step 152 is formed so as not to descend any further. In addition, a ring insertion groove 153 is formed in a side surface of the rotary shaft 150 in which the fixing ring 132 of the separable chamber 110 is inserted. The process of coupling the rotary shaft 150 and the separable chamber 110 will be described later.

The separable chamber 110 is detachably mounted on the rotary shaft 150 so that the molten metal melted in the crucible 112 is injected into the mold 115 by the centrifugal force generated by the rotation. The separable chamber 110 includes a support 130 directly coupled to the rotary shaft 150 and a first chamber 111 and a second chamber 121 provided at both ends of the support 130.

At the center of the support portion 130, a coupling hole 131 to be fitted in the shaft upper portion 151 of the rotary shaft 150 is formed so as to pass through in the vertical direction. The engaging hole 131 has a shape in which the diameter becomes narrower toward the upper side so as to correspond to the shape of the shaft top 151.

A fixing ring 132 inserted into the annular insertion groove 153 of the rotary shaft 150 is hinged to the side of the center of the support 130. Although the T-shaped fixing ring 132 is shown in this embodiment, the shape of the T-shaped fixing ring 132 is not limited.

Further, the fixing ring 132 is extended to the opposite side of the hinged portion to form an extension bar 132a, and a grip block 132b is provided at the end of the extension bar 132a. The function of the phage block 132b will be described later.

A grip ring 133 is provided at an upper portion of the support part 130 at a predetermined interval. Therefore, the entire separation chamber 110 can be stably lifted by holding the grip ring 133 through the gripping unit 190.

A state in which the support portion 130 is coupled to the rotation shaft 150 will be described with reference to FIG. The bottom surface of the supporting portion 130 abuts on the seating surface 152 when the engaging hole 131 of the supporting portion 130 is aligned with the shaft top 151 of the rotating shaft 150 and then lowered. Thereafter, the gripping block 132b is pulled and the fixing ring 132 is inserted into the ring insertion groove 153 to complete the coupling. At this time, a locking protrusion 154 is formed at the entrance of the ring insertion groove 153. When the fixing ring 132 is inserted into the annular groove 153, the fixing ring 132 is forced over the engaging jaw 154 by pushing or pushing the holding block 132b strongly, The fastening ring 132 is not easily released by the fastening protrusion 154. Of course, when releasing the fixing ring 132, the grip block 132b may be pushed up strongly.

The extension bar 132a on which the grip block 132b is provided is formed not to extend straight from the fixing ring 132 but to be bent in a direction away from the support 130. [

The grip block 132b functions as a handle when the fixed ring 132 is inserted into or removed from the annular groove 153. In addition, ). That is, the grip block 132b is relatively heavy compared to the extension bar 132a and the fixed ring 132, and the centrifugal force applied to a heavy object is higher. Therefore, when the rotary shaft 150 and the separable chamber 110 are rotated, strong centrifugal force acts on the grip block 132b provided on the bent extension bar 132a so as to be far from the support 130, The ring 132 is in close contact with the inside of the annular groove 153 of the rotary shaft 150. [ That is, the greater the centrifugal force applied to the grip block 132b, the greater the binding force of the fixing ring 132, and the binding force between the separation chamber 110 and the rotary shaft 150 increases.

The first chamber 111 and the second chamber 121 provided on both sides of the supporter 130 are symmetrical with respect to the center of the supporter 130. Since the configurations of the chambers 111 and 121 are the same, only the first chamber 111 will be described.

Fig. 6 is a plan sectional view schematically showing the inside of the first chamber 111, and Fig. 7 is a side sectional view. A crucible 112 and a metal mold 115 are installed in the first chamber 111 and an extension tube 114 extending from the crucible 112 protrudes below a portion where the crucible 112 is located. The extension tube 114 is a portion surrounded by the coil 140 of the high frequency heating section installed in the main body 100. The extension tube 114 is thus heated and the heat is transferred to the crucible 112.

The crucible 112 and the mold 115 are contained in the space inside the first chamber 111 and the inside of the first chamber 111 is sealed by the lid 119.

The crucible 112 is formed with an injection pipe 113 extending upward in one direction and having an open upper portion where the metal raw material is injected and melted.

The injection tube 113 of the crucible 112 is inserted into the movement hole 116 formed in the mold 115. When the melt is injected through the injection tube 113, the injection tube 113 moves along the movement hole 116, And is filled in the filling space 117 inside.

Meanwhile, the first chamber 111 is connected to a connection pipe 118a communicating with the inside and the outside, and the connection pipe 118a can be opened and closed through the valve 118. [

In this embodiment, a device using a coil 140 is used as a high-frequency heating portion for heating the crucible 112. The coil 140 includes a tub 114 exposed in a lower portion of the first chamber 111, And is vertically moved up and down from a position where it can be wrapped.

Hereinafter, a casting process using a vacuum centrifugal casting apparatus according to an embodiment of the present invention will be described with reference to FIG. Here, the description of the second chamber 121 is replaced with the description of the first chamber 111, since the configurations and operations of the first chamber 111 and the second chamber 121 are the same.

First, the lid 119 of the first chamber 111 is opened and the casting metal raw material is charged into the crucible 112 (S805). Then, the lid 119 is closed to seal the inner space of the first chamber 111. At this time, the first chamber 111 is provided with fixing means (not shown) for fixing the lid 119 for complete sealing, and a separate sealing portion (not shown) is provided around the lid 119. In addition, although the extension tube 114 connected to the crucible 112 protrudes downward of the first chamber 111, it is needless to say that the entire bottom of the first chamber 111 is also made to have a closed structure.

Thereafter, the valve 118 is opened and the vacuum pipe 181 is connected to the connection pipe 118a. Thereafter, the vacuum device 180 is operated so that the space inside the first chamber 111 is evacuated (the pressure is extremely low) S810 ", the connection of the vacuum pipe 181 is removed, and the valve 118 is closed so that the inside of the first chamber 111 is maintained in a vacuum state.

When the raw material is charged and the vacuum atmosphere is formed, the holding means 190 holds the holding ring 133 formed in the supporting portion 130 of the detachable chamber 110 to lift the detachable chamber 110. When the separable chamber 110 moves by the holding means 190 and the coupling hole 131 of the supporting portion 130 reaches the position corresponding to the shaft upper portion 151 of the rotary shaft 150, So that the shaft top 151 is inserted into the coupling hole 131.

Here, the diameter of the lower portion of the coupling hole 131 is relatively large, and the diameter of the upper portion of the shaft portion 151 is relatively small. Therefore, the initial coupling between the coupling hole 131 and the shaft top 151 is easy. When the shaft-shaped portion 151 is drawn into the coupling hole 131 and then the separable chamber 110 is lowered, Is naturally lowered along the tapered surface of the shaft top 151 and is brought into close contact with each other. The separable chamber 110 can be lowered until the bottom surface of the support portion 130 comes into contact with the seating surface 152 of the rotary shaft 150.

5, the supporting portion 130 having a cylindrical shape in cross section is illustrated, but the bottom surface of the supporting portion 130 abutting on the seating surface 152 may be made flat.

Thereafter, the holding block 132b provided at the center of the supporting portion 130 of the separate chamber 110 is pulled to fit the holding ring 132 into the ring receiving groove 153 of the rotating shaft 150 so as to separate the separating chamber 110 from the rotating shaft 150 < S815 >. Since the holding block 154 is formed at the entrance of the annular groove 153 of the rotating shaft 150, when the holding block 132b is pulled by force to strongly push the holding ring 132 into the annular groove 153, The fixing ring 132 is not easily detached by the stopping jaw 154. In addition,

On the other hand, when the detachable chamber 110 is coupled to the rotating shaft 150, the position of the detachable chamber 110 must be adjusted in order to fit the fixing ring 132 into the annular groove 153. Therefore, when engaging the detachable chamber 110 with the rotary shaft 150 through the gripping means 190, the operator has to adjust the rotation position appropriately so that the positions of the fixing ring 132 and the ring insertion groove 153 coincide with each other do.

If the end of the shaft portion 151 is formed in a polygonal shape rather than a circular shape and the joint hole 131 of the support portion 130 is also polygonal in cross section, 153) is more easily adjusted, and the rotational force can be transmitted more strongly.

In the above description, raw materials are charged into the crucible 112 in a state where the separated chamber 110 is located outside the main body 100, and the inside of the first chamber 111 is formed into a vacuum atmosphere, The separable chamber 110 and the rotary shaft 150 may be first coupled to the crucible 112, and then the raw material may be introduced into the crucible 112 to create a vacuum atmosphere.

Thereafter, the high-frequency heating coil 140 rises by a separate elevating means (not shown) and the crucible 112 is heated when it surrounds the extension tube 114. When the cast metal raw material is sufficiently melted by the heating of the crucible 112, the high-frequency heating coil 140 is lowered and the motor 170 is driven to rotate the rotary shaft 150.

When the centrifugal force acts on the crucible 112 due to the rotation of the separable chamber 110, the molten casting is released along the injection tube 113 of the crucible 112, The introduced molten material fills the filling space 117 (S825).

Here, when the rotary shaft 150 rotates, the fixing ring 132 also performs anti-slip and float prevention functions of the separable chamber 110.

That is, if the separable chamber 110 is placed on the rotary shaft 150 without the fixing ring 132, a slipping phenomenon may occur between the shaft upper portion 151 and the coupling hole 131. However, if the fixing ring 132 is firmly inserted and fixed in the annular groove 153, it is possible to reliably transmit the rotational force without slipping.

Further, since the separation chamber 110 is restrained by the fixing ring 132 on the rotation shaft 150, it is possible to prevent the separation chamber 110 from rising upward when the separation chamber 110 rotates. The object rotating at a high speed tends to lift up and lift up, which can be prevented by the fixing ring 132.

When the molten metal is filled in the filling space 117 of the mold 115, the rotation operation of the rotation shaft 150 is stopped and the holding block 132b of the separation chamber 110 is pushed upward, 150 from the hook insertion groove 153 of the hooking member 153.

The gripping unit 190 grasps and lifts the grip ring 133 of the separable chamber 110 so that the separable chamber 110 can be detached from the rotary shaft 150. [ When the separable chamber 110 is detached from the rotating shaft 150, the new separable chamber 110 is placed on the rotating shaft 150, and the above process can be repeated.

In addition, after the valve 118 of each of the chambers 111 and 121 is opened in the detached separated chamber 110, an inert gas is injected into the chambers 111 and 121 so that cooling is performed.

As described above, in the present invention, since the separable chamber 110 can be coupled to and separated from the rotary shaft 150, it is not necessary to wait until the cooling process is completed after the melt injection process is completed. That is, when the melt injection is completed, the separable chamber 110 can be released from the rotary shaft 150 and the new separable chamber 110 can be mounted to start the centrifugal casting. At the same time, So that a large number of products can be produced by continuous centrifugal casting.

Meanwhile, in the present invention, two chambers 111 and 121 are provided on both sides of the straight support part 130, but it is also possible that four chambers are provided on the cruciform supporting part. That is, the feature of the present invention is that the separable chamber 110 and the rotary shaft 150 are in a structure in which the rotary shaft 150 can be coupled to and separated from the rotary shaft 150. Therefore, the shape and the number of the chambers are not limited, It goes without saying that various modifications can be made.

9 is a view for explaining an example of a product produced by using the vacuum centrifugal casting apparatus shown in FIG. That is, when producing a small product such as a titanium watch or a mobile phone case, the centrifugal casting process must be continuously performed. In the present invention, the separable chamber 110 after centrifugal casting is separated from the rotary shaft 150 and cooled And the centrifugal casting process can be started immediately by attaching a new separable chamber 110 to the rotating shaft 150. The centrifugal casting process is not interrupted during the cooling of the mold 115 to allow a small product such as a titanium watch or a mobile phone case It is suitable for mass production.

In the meantime, the present invention is designed so that the separable chamber 110 and the rotary shaft 150 can be separated from each other for mass production of products through continuous operation. Therefore, when the rotary shaft 150 rotates, May rise and may inadvertently be separated from the rotary shaft 150. [ Of course, the separable chamber 110 and the rotary shaft 150 are fixed through the fixing ring 132 and the fixing ring 132 is prevented from being dislocated by the centrifugal force applied to the holding block 132b.

In addition, FIG. 10 shows an embodiment in which a structure for preventing floating of the separation-type chamber 110 by air resistance is added. The vacuum centrifugal casting apparatus according to the present embodiment has the same configuration as that of the previous embodiment except that the float prevention vanes 111a and 121a are added.

Referring to FIG. 10, it can be seen that the flotation prevention vanes 111a and 121a are provided in the first chamber 111 and the second chamber 121, respectively, in the separation type chamber 110. The anti-flood prevention vanes 111a and 121a are in the form of a plate having a predetermined area and are slanted so that the lower portion thereof is directed to the proceeding direction and the upper portion thereof is directed to the opposite direction to the traveling direction with respect to the rotating direction of the separable chamber 110.

10, when the separable chamber 110 is rotated in the counterclockwise direction, air resistance is applied in the upward direction of the anti-flood prevention vanes 111a and 121a provided diagonally as shown in FIG. 11 will be. Therefore, the anti-flushing vanes 111a and 121a will be forced downward by the air resistance, so that downward force acts on the entire separable chamber 110 including the chambers 111 and 121, Can be reliably prevented.

The foregoing description of the preferred embodiments of the present invention has been presented for the purpose of illustration and it will be apparent to those skilled in the art that various modifications, additions and substitutions are possible within the spirit and scope of the invention, And additions should be considered as falling within the scope of the claims of the present invention.

100:
110: detachable chamber
111: first chamber
111a: anti-flap wing
112: Crucible
113: injection tube
114: Toolbox
115: mold
116: moving hole
117: filling space
118: Valve
118a: connector
119: Cover
121: Second chamber
121a: anti-flap wing
130: Support
131: Coupling hole
132: Retaining ring
132a: Extension bars
132b: Phage block
133: Phage ring
140: Coil
150:
151: shaft top
152: seating chin
153: ring insertion groove
154:
155: pulley
160: belt
170: motor
180: Vacuum device
181: Vacuum piping
190: gripping means

Claims (5)

A rotating shaft which receives power from the motor and rotates and has a ring insertion groove formed on a side thereof; And
And a separation chamber having a coupling hole through which the upper portion of the rotary shaft is fitted and having a fixing ring fitted in the circular insertion groove.
The method according to claim 1,
Wherein a hook is formed at the entrance of the ring insertion groove of the rotary shaft so that it is inhibited from being detached when the fixing ring of the separate chamber is pushed into the ring insertion groove of the rotary shaft.
The method according to claim 1,
Wherein the fixing ring is rotatably hinged to the detachable chamber and the grip block is extended from the hinged portion.
The method according to claim 1,
The upper portion of the rotating shaft is tapered so as to be narrower toward the upper side,
Wherein the coupling hole of the separable chamber has a shape corresponding to the upper portion of the rotary shaft and having a width becoming narrower toward the upper side.
The method according to claim 1,
Wherein the separable chamber is provided with a plate-shaped flotation prevention blade having a diagonal line so that the lower side of the separable chamber faces the direction of travel and the upper side of the detachable chamber faces the opposite direction of the travel direction.

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